Cambridge IGCSE Chemistry · Syllabus 0620 · The Periodic Table
Displacement Reaction
What is Displacement Reaction?
A reaction in which a more reactive element takes the place of a less reactive one in a compound. In Group VII a more reactive halogen displaces the halide ion of a less reactive halogen from solution: the added halogen takes the electron and becomes the halide ion, while the halide already present loses its electron and is released as the free halogen.
This definition is part of the The Periodic Table chapter in Cambridge IGCSE Chemistry.